Corrosion resistance of a laser spot-welded joint of NiTi wire in simulated human body fluids
✍ Scribed by Xiao-Jun Yan; Da-Zhi Yang
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 354 KB
- Volume
- 77A
- Category
- Article
- ISSN
- 1549-3296
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✦ Synopsis
Abstract
The purpose of this study was to investigate corrosion resistance of a laser spot‐welded joint of NiTi alloy wires using potentiodynamic tests in Hank's solution at different PH values and the PH 7.4 NaCl solution for different Cl^−^ concentrations. Scanning electron microscope observations were carried out before and after potentiodynamic tests. The composition of a laser spot‐welded joint and base metal were characterized by using an electron probe microanalyzer. The results of potentiodynamic tests showed that corrosion resistance of a laser spot‐welded joint of NiTi alloy wire was better than that of base metal, which exhibited a little higher breakdown potential and passive range, and a little lower passive current density. Corrosion resistances of a laser spot‐welded joint and base metal decreased with increasing of the Cl^−^ concentration and PH value. The improvement of corrosion resistance of the laser spot‐welded joint was due to the decrease of the surface defects and the increase of the Ti/Ni ratio. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2006